Gymnocalycium denudatum subsp. angulatum Prestlé in Gymnocalycium 17: 573. 2004 Gymnocalycium denudatum subsp. angulatum Prestlé in Gymnocalycium 17: 573. 2004is basionym for Gymnocalycium volskyi subsp. angulatum (Prestlé) V.Gapon, Chikin, Ponomareva, Protopopov, B. & Schelkun. in Kaktus-Klub, n.s. 4(2): 28. 2020Taxon for this nameGymnocalycium denudatum subsp. angulatum Prestlé